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 A063613 Smallest k such that 7^k has exactly n 7's in its decimal representation. 0
 2, 1, 14, 11, 26, 29, 49, 33, 67, 81, 84, 96, 101, 95, 89, 132, 163, 160, 137, 152, 185, 177, 195, 230, 205, 188, 214, 267, 274, 288, 325, 307, 286, 285, 270, 311, 324, 353, 318, 336, 309, 329, 403, 375, 432, 436, 447, 479, 401, 459, 491 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..50. MATHEMATICA a = {}; Do[k = 1; While[ Count[ IntegerDigits[7^k], 7] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a Module[{p7=DigitCount[#, 10, 7]&/@(7^Range[500])}, Table[Position[p7, n, {1}, 1], {n, 0, 50}]]//Flatten (* Harvey P. Dale, Apr 08 2017 *) CROSSREFS Sequence in context: A187920 A307804 A338207 * A245733 A276851 A080346 Adjacent sequences: A063610 A063611 A063612 * A063614 A063615 A063616 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 EXTENSIONS Name corrected by Jon E. Schoenfield, Jun 26 2018 STATUS approved

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Last modified August 11 04:26 EDT 2024. Contains 375059 sequences. (Running on oeis4.)